Claims
- 1. In an apparatus for providing lifting insert cavities in molded concrete pipe made from concrete which is poured into a pipe mold comprising rigid, inner and outer spaced shells and prior to the curing of the concrete poured therein: an inner shell and an outer shell fixed in spaced relation to each other to provide a mold in which poured concrete is placed in the space between said inner and outer shells to cure and form a rigid concrete pipe, said outer shell having at least one thru opening therein leading into the space between said inner and outer shells and receiving a cavity forming insert therethrough the cavity forming insert constructed from plastic or a similar material comprising an insert body of a size smaller than the opening in the outer shell whereby said cavity forming insert is inserted thru said opening from outside after said inner and outer shells are assembled to support said insert on said outer shell and in alignment with the opening therein, said cavity forming insert having an opening in the top thereof which when in position is exposed thru the opening in said outer shell and said insert opening leading into the interior and to a closed bottom in said insert, a retaining means detachably attached to said outer shell, means on said outer shell removably attaching said retaining means to said outer shell, means on said retaining means for positioning same in said insert body prior to insertion in said opening in said outer shell for a temporary but firm engagement therewith to attach same thereto for subsequent removal therefrom after the concrete pipe is cured, and to hold same in position between said inner and outer shells whereby said insert remains inside said concrete to receive a lifting insert therein.
- 2. The apparatus in claim 1, further including pressure means operable between said retaining means and said cavity forming insert for mounting said cavity forming insert under pressure.
- 3. The apparatus of claim 2 further including compressible gasket means about the opening to the cavity forming insert and being compressed by said pressure means.
- 4. The apparatus in claim 1 wherein said retaining means comprises a retaining member inserted into said insert and there being spring means operatively associated with said retaining member for resisting the movement of said retaining member whereby said retaining member is inserted against the spring pressure thereby providing spring pressure to hold said member retaining in place.
- 5. The apparatus claimed in claim 1 wherein said attaching means includes a mounting plate comprising a pair of open slots on opposite ends thereof, a pair of respective bolts mounted in said outer shell and respective nuts on said bolts in engagement with said mounting plate after said bolts are inserted in said notches thereon.
- 6. The apparatus claimed in claim 4 wherein said retaining member is an elongated shaft mounted for substantially straight line movement on an attaching plate, said plate being attached to said pipe mold outer shell about said pipe opening.
- 7. The apparatus claimed in claim 1 wherein the top of said cavity forming insert has a flat surface therearound, and a gasket mounted on said flat surface compressed into position by said retaining means.
- 8. The apparatus claimed in claim 1 wherein said cavity forming insert comprises at least one channel leading to a respective tunnel at the bottom of said cavity forming insert and each respective tunnel leading to a respective recess, said retaining means comprising a retaining member having at least one projection thereon fitting into a respective recess.
- 9. The apparatus claimed in claim 4 wherein said retaining member comprises a flanged portion attached thereon near the top thereof and a handle extending from the top of said retaining member.
- 10. In an insert positioning means for providing a specially shaped cavity on the side of a concrete pipe by placing said insert into position between the inner and outer shells of a pipe mold prior to the curing of concrete poured therein: a concrete pipe mold comprising rigid, concentrically arranged inner and outer shells and said outer shell having a respective cavity forming insert opening formed therein leading to the interior thereof, a cavity forming insert constructed from thin plastic or a similar material having an open top leading to a closed bottom, said insert having at least one channel leading to the bottom thereof and a respective tunnel at the bottom of each channel leading to an off-set recess therein, a retaining means comprising a retaining member including an elongated shaft, a mounting means on said retaining means temporarily attaching said retaining means to said outer shell about said insert opening, said retaining member having at least one projecting portion on the end thereof corresponding with a respective off-set recess formed in the bottom of said insert, spring means on said retaining member, said retaining member being pushed into said insert prior to the positioning of said insert in said pipe mold to cause said projecting portion to be located within said respective off-set recess after travelling down said channel and through said tunnel against the spring pressure on said retaining member thereby tightly positioning said insert on said retaining member and said retaining member in place on said outer shell whereupon after the pouring and curing of the concrete a cavity of special formation is left in said concrete pipe and defined by said cavity forming insert so that a lifting instrumentally, such as an eye-bolt may be inserted down into said cavity so formed by said insert and rotated into position in said respective off-set recesses whereby said pipe may be lifted from said eye-bolt thereby reducing the possibility of breakage.
- 11. The apparatus of claim 10 further including a compressible gasket on said insert which is compressed by said retaining member upon insertion into said insert to prevent wet concrete from entering said insert.
- 12. The apparatus in claim 11 wherein said mounting means comprises a mounting plate having notches on opposite ends thereof and a pair of screws on said outer pipe onto which said plate fits.
- 13. The apparatus in claim 12 wherein said spring means on said retaining member comprises a coil spring which is confined between said mounting plate and a part of said retaining member.
Parent Case Info
This is a continuation of application Ser. No. 530,983 filed Dec. 9,1974, now abandoned.
US Referenced Citations (5)
Foreign Referenced Citations (1)
Number |
Date |
Country |
296,500 |
Sep 1928 |
UK |
Continuations (1)
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Number |
Date |
Country |
Parent |
530983 |
Dec 1974 |
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